Tubular insulator.



' L. STEINBERGBR;

TUBULAR IN SULATOR.

APPLIUATION FILED JUNE 4, 1990.

927,1 85. Patented July 6,1969.

l'A/VENTOH I I ATTORNEYS T all whom it may concern:

' proved Tubular Insulator,

LOUIS srnnvnnaeaa, or New YORK, N. Y.

TUBULAR INsULA'roR.

$pecification of Letters Patent.

Patented July 6; 1909.

Application filed. June 4,1906. Serial No. 320,068.

Be it known thatI, Louis S'rnmnnnenn',

a citizen of the United States, and a resident of the city of New York, borough ofBrooklyn, in the county of Kings and State of New.York, have invented a new and Imof which the fol.

' lowing is a full, clear, and eXact description.

My invention relates to insulators, my more part cular ob ect being to produce a hightenslon insulating tube suitable for insulating cables, wires and other conductors, ener forms of conductors; sulating tube of such novel construction that should a .portion of the outer tube become through it will not injureviding a very insulating gized by high-tension currents, the tube pro- 7 high degree of insulation and at the sametim'e affording great mechanical strength. i

Among the'several objects I accomplish by my insulating tube are the following: 1,.to provide an insulating tube having protected portions and drip edges on the outer surface, thereby redr sing the surface leakage to a minimum; .'2, to provide atube of novel. construction combining the use of solid material with air spaces;

tube, of such conformity as to economize the material for enabling air spaces to perform the office of insulation; 4, to provide an insulating tube that combines compactness, large housing degree of insulation, and great mechanical strength; 5, to provide an insulating tube that will admit a comparatively large cable and at; the same time provide a plurality of separate insulating compartments for the admission of smaller cables, wires, or other 6, 'to provide an indamaged or broken the cable threaded through its central orifice; 7, to provide a tube of such novel conformity as to oiicr great resistance to both crushing and torsional strains. 7

Reference is to be had to the accompanying drawings forming apart of this specification, in which similarcharacters of reference indicate corresponding parts in all the figures. Figure 1 is a side elevation of an insulating tube made in accordance with myinvention Fig. 2 is a substantially central section through a plurality of insulating tubes shown in Figs. 1 and 3, and connected together into a continuous member,- the section being taken on the line. 22 of -F1g. 3; Fig. 3 is {ah-horizontal section of the insulating tube and is-taken uponthe which acable or other conductor may of the paiiii 14 as shown more particularly in 3, to provide an area, a very high formity of the parts is such as line 33 of Fig. 2, 1

looking toward the bottom of the sheet; and Fig. 4 is an end elevation of the msulating tube.

Tubular members 4, 5 and 6 are disposed concentrically, the innermost being provided with an annular cylindrical space 7 through c threaded. 'Spacing partitions S, 9 separate the tubular membersfrom each other. Ar-

cuate spaces 10 ;,are disposed intermediate of the partition o'r bridges 8, and intermediate Zions or bridges 9 are arcuatc The tubular memberA is the spaces 11.

three tubular members and outermost of the is provided externally surfaces .12, 13, the latter being undercut at annular head 15 is provided for the purpose of supporting the weight of the insulating with annular sloping Fig. 2. An

tube andsuch conductors asmay be in turn su ported by it. tu e are integral.

All partsof the insulating My invention is used as follows :The in sulating tubeis mounted in position by bemg merely inserted within a suitable aperture.

' A conductor, such as a cable or a large wire, may now be threaded through the cylindrical space 7 of the tubular member 6/ In this case the spaces 10, 11 ordinarily serve as air spaces and improve the insulating qualities of the device. If desired, however, comparatively small conductors, such as wires, I

maybe threaded separately through the spaces 10, 11-, and thus not only separated from other conductors but thorough y insulated as well. In case several wires are separately they may more of the spaces 10, 11. W

In the construction described, the-conto afford a maximum of mechanical strength with a minimum of material. The insulating tube as a whole may be considered as having a cellular texture. It should be noted that the distance from the cylindrical aperture 7 to the. outer circumference of the insulatoris considerable as compared with the uantity of material employed in the insu ator,

insulated each with its own covering,

be threaded through any one or It will also be. noted that the bridges 9 are 7 to some of the bridges 8, and that the circumferential widths of the spaces 10 arenot. very difierent from those of the spaces -11. This insures conformity of cellular structure.

If the insulating staggered. relatively tube be subjected to a crushing strain either in the general direction of its longest axis or across the direction of suchaxis, the strains are so distributed that the insulating tube is not readily broken. The under-cuts l4. tend to prevent the creeool moisture over the outer surface of t 1e insulator. in case the surfaces 12, 13, should become wet by the leakage of moisture, or otherwise, the under-cut portions 13 are so disposed as not to be within the path of the moisture, the result being that the insulating tube will always present a number of comparatively dry annular spaces. it will be noted that the under-cuts 14 are found only upon the upper half of the insulator as shown in Fig. 2, the material below the apnular surfaces 12 being solid. The DUI'POSQ of this ar rangement is to increase the strengthof the insulator at its lower end, the principle being that the upper middle part of the insulator is usually protected within the aperture, and is, if practicable, a little more secure than the lower portion.

he insulating tube is provided at one of ends immediately adjacent to the annular head 15 with a boss 16 provided with an a11- nular channel 17 whereby it is encircled. This boss is provided with ordinals 18, 19, whereby the various arcuate spaces 10 may be designated and conveniently located so as to be distinguish able from each other. This a ri'angeinentis of special value in cases where wires are threaded through the ar'cuate spaces 10, 11, and where it is desired to keep several. insulating tubes in such registry'with each other that the wires pursue practically the same course througlmut all of the connected insulating tubes. Each of the spaces or conlpartuients being located numerically enables the engineer to locate any particular cable, Wire, or wires, shouldv it become necessary to repair or remove them, besides enabling him to keep a record regarding the number ol' compartments still available incase they should have been left unused when the tubes were just installed. Each insulating tube is also iu'ovidcd with an annular depression 20 merging into an annular chan nel 21, these parts upon one tubular insulato:- being arranged to register with the boss 16 and the channel 17 of the next successive insulating tube asshown in Fig. 2. When '"wo oi the insulating tubes are thus fitted together a plastic material may be filled into the clumnels 2O, 21, which are now merged together and constitute a channel having a cylindrical cross section. shown in said figure. The member 22 of this figure repre scum an annular holding of insulating material. llach insulating tube is provided with on aperture 23 'l'or permitting the in- :roduclion of the material thus used as a filling.

ll. o luiowo principle that throughout all m. having the form (if a cylinder or of a plurality of concentric cylinders are of comparatively great strength. lt also true that a given amount of material p messes a maximum of torsional and tensile strength. if made into the form of v. cylimlcr. it is upon this account that iiincorporate in my tube a plurality of tubular members. if, however, these tubular members were loose relatively to each other, or were not connected together by any sort of positive members or connections, their strength would not be as great as if properly connected and their rigidity as a unit would be impaired. Besides it would be less cile'ctive for insulating purposes. It is for this reason that I employ the bridges 8, 9 and also make the sev- Qer al parts integral. 1 do not limit myself, however, to the precise construction shown. Neither do 1 limit myself to the exact con-- forrnity of anypart of the tube, nor to any particular material out of which the latter is constructed. When desired for insulating purposes I prefer to use the material known in this art as. eiectrose, but hard rubber, porcelain, glass, or in fact almost any other suitable insulating material may be en1- ployed. I do not in every instance limit myself to the-use-oi insulating material, nor do I restrict the use of the device to purposes of insulation.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. A tube of insulating material,.compris ing a plurality of cylindrical members disosed concentrically and connected together partitions, used for connecting together two of said tubes, being staggered relatively to anotherof-said partitions used lor connecting together two other tubes.

2. A tube of insulating material, comprising a plurality of cylindrical members disposed concentrically and connected together by spacingpartitions, one of said spacing partitions being staggered relatively to another of said spacing partitions, and a plurality of other spacing partitions disposed one nearer the center than another and in direct radial ai neinent relatively to said center.

3. A tube of insulating material, comprising a plurality of cylindrical members disposed concentrically and'connccted together by spacing partitions, one of said spacing partitions being staggered relatively to another, said tube being further provided with ordinals arranged in di'll'crent groups, the ordinals of one group being staggered relatively to those ol the other group for the pur pose oi-indicating the relative location of spaces intermediate said partitions.

4. The combination of a plurality of tubes, each provided adjacent to one of its ends Witlra cylindrical portion encircled by an )y spacing partitions, one oi said spacing end of said tube mating the annular channel annular channel, each tube being further ofholdingsaidtubes together and being alone 10 provided at its opposite end with a cylin- E snfi'icient for this purpose.

drical portion havmg an z'znnulzn channel in- 1 In testimony whernot I have signed my ternally thereof, the annular channel of one name to this specification. in the presence of t two subscribing witnesses.

oftheo positeendoftl'mnnxtsuccessivetube, 1 LOUIS STEINBEKKGER.

a mem er disposed partly Within the annutar t -,""'Jitnesscs:

channel of one tube and partly in the :mnu- WALTON HARRISON,

lar channel of the otHer tube for the purpose JNO. M. BITTER. 

